The Romer model can be described by 4 equations:
Yt = AtLyt
∆At+1 = zAtLat
Lyt + Lat = L
Lat = IL
Y is final output, A is ideas/knowledge, Ly is
employment in production of final output, La is the
number of researchers and L is the population.
a) What is the driver of long-run growth in this model?
b) Using the equations in the question, show that the growth
rate of output per capita can be written as...